Dual electro-optic frequency comb photonic thermometry

TL;DR

This paper demonstrates a high-precision, rapid, and scalable photonic thermometry method using dual-comb spectroscopy and electro-optic fiber Bragg gratings, suitable for industrial and multi-parameter sensing.

Contribution

It introduces a dual-comb spectroscopy approach combined with electro-optic fiber Bragg gratings for precise, rapid, and scalable temperature measurements without laser tuning.

Findings

Achieved 7.5 mK stability at 1 s for temperature read-out

Resolved temperature changes of similar magnitude in real-time

Demonstrated reproducibility aligned with the International Temperature Scale

Abstract

We report a precision realization of photonic thermometry using dual-comb spectroscopy to interrogate a $\pi$-phase-shifted fiber Bragg grating. We achieve read-out stability of 7.5 mK at 1 s and resolve temperature changes of similar magnitude--sufficient for most industrial applications. Our dual-comb approach enables rapid sensing of dynamic temperature, and our scalable and reconfigurable electro-optic generation scheme enables a broad sensing range without laser tuning. Reproducibility on the International Temperature Scale of 1990 is tested, and ultimately limited by the frequency reference and check-thermometer stability. Our demonstration opens the door for a universal interrogator deployable to multiple photonic devices in parallel. Applications include on-chip measurements to simultaneously evaluate quantities like temperature, pressure, humidity, magnetic field and radiation dose.